參數(shù)資料
型號: DSP56855BUE
廠商: Freescale Semiconductor
文件頁數(shù): 17/52頁
文件大?。?/td> 0K
描述: IC DSP 16BIT 120MHZ 100-LQFP
標(biāo)準(zhǔn)包裝: 90
系列: 568xx
核心處理器: 56800E
芯體尺寸: 16-位
速度: 120MHz
連通性: EBI/EMI,SCI,SSI
外圍設(shè)備: DMA,POR,WDT
輸入/輸出數(shù): 18
程序存儲器容量: 48KB(24K x 16)
程序存儲器類型: SRAM
RAM 容量: 24K x 16
電壓 - 電源 (Vcc/Vdd): 1.62 V ~ 1.98 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 100-LQFP
包裝: 托盤
56855 Technical Data, Rev. 6
24
Freescale Semiconductor
4.5 External Clock Operation
The 56855 system clock can be derived from a crystal or an external system clock signal. To generate a
reference frequency using the internal oscillator, a reference crystal must be connected between the
EXTAL and XTAL pins.
4.5.1
Crystal Oscillator
The internal oscillator is designed to interface with a parallel-resonant crystal resonator in the frequency
range specified for the external crystal in Table 4-5. In Figure 4-6 a typical crystal oscillator circuit is
shown. Follow the crystal supplier’s recommendations when selecting a crystal, because crystal
parameters determine the component values required to provide maximum stability and reliable start-up.
The crystal and associated components should be mounted as close as possible to the EXTAL and XTAL
pins to minimize output distortion and start-up stabilization time.
Figure 4-6 Crystal Oscillator
4.5.2
High Speed External Clock Source (> 4MHz)
The recommended method of connecting an external clock is given in Figure 4-7. The external clock
source is connected to XTAL and the EXTAL pin is held at ground, VDDA, or VDDA/2. The TOD_SEL
bit in CGM must be set to 0.
Figure 4-7 Connecting a High Speed External Clock Signal using XTAL
Sample External Crystal Parameters:
Rz = 10MΩ
TOD_SEL bit in CGM must be set to 0
Crystal Frequency = 2–4 MHz (optimized for 4MHz)
EXTAL XTAL
Rz
56855
XTAL
EXTAL
External
GND,
VDDA,
Clock
(up to 240MHz)
or VDDA/2
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DSP56857BU120 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 120Mhz/120MIPS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT